$TTL TIMETOLIVE
@       IN      SOA     MNAME. (
                RNAME.      ; Email address of the domain owner 
                SERIAL; the Serial Number
                REFRESH; the Refresh Rate
                RETRY;  the Retry Time 
                EXPIRY; the Expiration Time
                MINIMUM) ; the Minimum Time 
                
                NAME_SERVER_LINE
                    MX_RECORD_LINE
@                   IN A DEFAULT_IP_ADDRESS
